Based on the data provided, we can observe that the coin in question has had a starting price in the current auction of 60 euros and is in a conservation grade of 70 (MBC-). Additionally, it has been auctioned in the past 21 times, out of which it has been sold 20 times and not sold once.

The average starting price in previous auctions has been 78.33 euros, while the average final price has been 130.25 euros. Regarding the previous prices of this coin, there is a variation in starting, estimated, and final prices throughout past auctions.

Given that the conservation grade of the coin is 70 (MBC-), and considering the previous prices of similar auctions, as well as the current starting price, we could estimate a maximum purchase price around 100-120 euros. It is important to note that this is just an estimate and the final price may vary depending on the demand in the current auction.